B61L 23/34
Control, warning or like safety means along the route or between vehicles
Official title: for indicating the distance between vehicles or trains by the transmission of signals therebetween
B61L23/34 (Control, warning or like safety means along the route or between vehicles) appears on 196 US grants and 198 published applications in this corpus.
Search patents in B61L- Granted patents
- 196
- Published applications
- 198
- Assignees
- 108
- Inventors
- 401
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 2 |
| 2003 | 1 | 0 |
| 2004 | 0 | 5 |
| 2005 | 0 | 2 |
| 2006 | 2 | 2 |
| 2007 | 2 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 5 |
| 2013 | 0 | 0 |
| 2014 | 9 | 10 |
| 2015 | 7 | 3 |
| 2016 | 8 | 25 |
| 2017 | 11 | 6 |
| 2018 | 11 | 20 |
| 2019 | 14 | 16 |
| 2020 | 12 | 19 |
| 2021 | 16 | 22 |
| 2022 | 17 | 15 |
| 2023 | 14 | 19 |
| 2024 | 19 | 14 |
| 2025 | 14 | 7 |
| 2026 | 8 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Methods and systems for decentralized rail signaling and positive train control6 Oct 2026US 12,752,823 B2Metrom Rail, LLC
- System and method for signalling events through a visibility marker associated with a train28 Jul 2026US 12,691,915 B2Siemens Mobility GmbH
- Railway communications system21 Jul 2026US 12,686,424 B2
- Forward monitoring device and forward monitoring method2 Jun 2026US 12,643,584 B2Mitsubishi Electric Corporation
- System and method for railroad personnel safety assurance12 May 2026US 12,623,702 B2BNSF Railway Company
- Method and system for obstacle identification during and after train coupling30 Jul 2026US 2026/0217292 A1Siemens Mobility GmbH
- A railway communications system15 Jan 2026US 2026/0015020 A1
- System and method for virtual approach signal restriction upgrade3 Jul 2025US 2025/0214633 A1BNSF Railway Company
- System and/or method for platooning12 Jun 2025US 2025/0187639 A1Parallel Systems, Inc.
- Interconnection and intercommunication method and system for virtual marshalling train control system in heavy haul railway5 Jun 2025US 2025/0178654 A1Casco Signal Ltd.
Most cited
By later US patents
- Automatic vehicle following control system173US 6,128,559 AHonda Giken Kogyo Kabushiki Kaisha · 2000
- System and method for remote control of unmanned vehicles132US 9,720,419 B2Humanistic Robotics, Inc. · 2017
- Method and system for proximity detection and location determination117US 6,218,961 B1GE Harris Railway Electronics, LLC · 2001
- Vehicle longitudinal spacing controller98US 5,777,451 ANissan Diesel Motor Co., Ltd. · 1998
- Regulating a railway vehicle94US 5,440,489 AWestinghouse Brake and Signal Holdings Limited · 1995